Proposal: Embedded Expressions for String Statements (original) (raw)

John Rose John.Rose at Sun.COM
Fri Mar 20 13:50:05 PDT 2009

I wrote the spec. draft and implementation (in antlr) for Groovy
gstring syntax; I did the work with the intention of helping the JSR
241 Groovy standard. It could work in Java with adjustments, and the
Groovy spec. is detailed enough to be a starting point. I don't
really have time to work on it though. That's why I haven't done a
proposal.

For Java, to extend the string syntax and emphasize that a new string
is being constructed, I recommend this:

new "$foo, ${bar}s."

The new kwd enables the dollars. Other details to be taken from the
Groovy spec.

Best wishes,

-- John (on my iPhone)

On Mar 19, 2009, at 8:33 AM, phil swenson <phil.swenson at gmail.com>
wrote:

funny, i just joined the list specifically to ask about this subject.

why not just copy the groovy implementation of this? varorvar or varor {expresion} ? in groovy it would be: "[$field1, field2,field2, field2,field3]" or with the explicit expression syntax: "[${field1}, field2,{field2}, field2,{field3}]"

I hate escape characters :) On Thu, Mar 19, 2009 at 2:03 AM, Schulz, Stefan <schulz at e-spirit.de> wrote: The concat-variant to me is even worse readable than the original +- notation, having three consecutive commas in between. The proposal already mentions concatenation of any kind as alternative, although not mentioning concat(). Maybe worth expanding.

Stefan

-----Original Message----- From: rssh at gradsoft.com.ua [mailto:rssh at gradsoft.com.ua] Sent: Wednesday, March 18, 2009 8:58 PM To: Howard Lovatt Cc: coin-dev at openjdk.java.net; Schulz, Stefan Subject: Re: Proposal: Embedded Expressions for String Statements

I like Stefan's proposed syntax and as a way of a motivating example consider writing a toString method that gives the field values within square brackets, now you would write:

"[" + field1 + ", " + field2 + ", " + field3 + "]" With the proposal you would say: "[{field1}, {field2}, {field3}]" Which I find clearer.

Just note: now we can use much cleaner concat( field1, ',' , field2, ',' field3 )

Many thanks to Stefan for writing this up formally.

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